Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2014

The Company’s financial instruments, other than cash, consist primarily of cash equivalents, short-term investments, accounts receivable, accounts payable and accrued expenses. The carrying value of these financial instruments approximates their fair value. Cash equivalents consist of highly liquid investments with a maturity of three months or less at date of purchase. Short-term investments have a maturity of greater than three months at date of purchase. Cash, cash equivalents and short-term investments consist of the following:



	March 31, 2014			December 31, 2013
	Cost		Fair Value	Cost	Fair Value
Cash and Cash Equivalents:
Cash and overnight deposits	$	584,552	584,552	590,317	590,317
Corporate commercial paper	506,872		506,958	629,923	629,990
Time deposits	39,622		39,622	27,412	27,412
Total cash and cash equivalents	1,131,046		1,131,132	1,247,652	1,247,719
Short-Term Investments:
Corporate commercial paper	86,449		86,521	26,296	26,321
Time deposits	42		42	41	41
Total short-term investments	86,491		86,563	26,337	26,362
Total	$	1,217,537	1,217,695	1,273,989	1,274,081

The fair value of corporate commercial paper is based on the use of market interest rates for identical or similar assets (Level 2 fair value measurement).

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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